Container and method of making same



Dec. 30, 1952 l. L. wlLcox 2,523,580

CONTAINER AND METHOD @E MAKING SAME Filed sept. 4, 1948 2 SHEETS- SHEET M w, ma W VC m am a. mwa lll In! `r /fm .m Y B,

Dec. 30, 1952 1. l.. wlLcox 2,623,680

CONTAINER AND METHOD OF MAKING SAME Filed sept. 4, 1948 2 SHEETS- SHEET 2 WIN DING ZSU'FOFF JNVENTOR. /sanc L. W/cox Patented Dec. 30, 1952 CONTAINER AND METHOD OF MAKING SAME lisaac L. Wilcox, Fulton, N. Y., assignerV to Oswego Falls Corporation, Fulton, N. Y., a. corporation of N ew York Application September 4, 1948, Serial No. 47,923

(Cl. 22S-4.5)

3 Claims.

This invention relates to a container andthe method of making the same. More particularly, it relates to a container formed of paperboard having a cylindrical or tubular body formation formed by winding a plurality of plies in a spiral tubular formation. The conventional method of making such containers is to Wind two or more plies of paperboard on a conventional tube winding machine and during the winding operation to apply a permanent set adhesive .between the plies.

This invention has as an object a container of the type referred to wherein the body portion of the container consists of inner and outer multiply layers, one of which is shifted axially relative to the other to provide end portions of reduced wall thickness.

The invention has as a further object a method for producing such a body member by shifting the layers subsequent to the winding operation and without cutting and .removing any of the stock from either layer.

The invention has as a further object a container of the type referred to wherein the bottom or end closure consists only of a circular disk of paperboard inserted in the outer shifted layer and seated against the adjacent end of the inner layer, and being sealed thereto by the adhesive material employed to join the contiguous plies of the inner and outer layers, whereby the adjacent end of the inner layer is blocked off by the adhesive, thus preventing the raw edges of the plies of the inner layer from absorbing the liquid contents of the container. This application is a continuation in part of my application Serial No. 552,502, led September 2, 1944, now abandoned.

The invention consists in the novel features and in the combinations and constructions and the method hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

Figure 1 is a side elevational View of a tubular body section employed in the construction of the container of my invention, the tubular body section being shown `partly in section,

Figure 2 is a side elevational View of a container embodying my invention, with parts shown in section.

Figure 3 illustrates tools suitable for effecting shifting of the inner and outer layers of the structure shown in Figure 1.

Figure 4 illustrates diagrammatically the 2. equipment used in carrying out the method of making Vthe container.

Figure l illustrates the tubular body formation prior to the shifting of the inner and outer layers. This tubular formation is produced on a conventional tube winding machine having a stationary mandrel I il. The inner layer I I consiste of inner and Iouter plies I2, I 3, and. ythe outer layer I 4 consists of plies I5, I3. In the winding operation, the ply I2 is fed next to the mandrel I0. The ply I3 is fed onto the ply I2 and adhered thereto :by adhesive I8. The ply l 5 is next fed onto the plyA I3 and secured thereto by adhesive 20, andthe outer ply IS is fed upon the ply I5, all of the plies being continuously wrapped spirally about the mandrel by a driving' belt 2l, as will be Well understood by those iamiliar with the tube winding art. The plies I2, I3, I5, and I6 are fed 01T from large rolls, whereby the Winding operation is continuous, the tubular formation progressing outwardly from the free end of the mandrel and being cut into sections of desired length by a cutter 23 forming part of the tube winding machine.

The adhesive I8 between the plies I2, I3, and the adhesive 24 between the plies I5, I6, is of the type resistant to elevated temperatures. That is, its adhesive properties are not disturbed by a temperature rise considerably above room temperature.

The adhesive 20 however between the contiguous plies I3, I5, of the respective layers is of the non-penetrating type of hot melt adhesive. That is, the adhesive melts, or liquifies, and flows readily when subjected to a temperature above ordinary room temperatures but well below any temperature harmful to the adhesives I8u 24. There are certain hot melt adhesives which, When they liquify, are readily absorbed into paperboard, leaving substantially none of the adhesive on the surface of the board. Paraiin is an example of such adhesives.

The type of adhesive however that I employ between the plies I3, l5, melts and liquides readily at relatively low temperatures, but remains upon the surface of the paperboard without any substantial absorption of the adhesive by the board. Examples of such type of adhesive are cellulose acetate butyrate, commercially known as Tenite #2, polyethylene, and polyvinyl acetate mixed with ester gum.

The tubular sections 22 are subjected to the application of heat sufficient to liquify the adhesive 20 and while this adhesive is in liquid state, the inner and outer layers II, I4, are shifted axially, as illustrated in Figures 2 and 3. The sections 22 may be conveniently heated by advancing them through a suitable oven, or heater 28 equipped with heating elements 29, the heated sections being advanced to suitable shifting tools as 30, 3|, the tool 3! being formed with a shoulder 33 yto engage the end of the inner layer ll, and the tool 3i with a similar shoulder 3d engaging the end of the outer layer Eli. Relative axial movement between these tools While the adhesive 29 is in the liquid state, effects axial shifting of the layers.

A bottom end closure 33 is inserted Within the outer shifted layer lli. This disk 35 is formed to have a relatively snug iit within the projecting end portion of the outer layer and is accordingly adapted to scrape oii the adhesive 23 remaining on the inner surface or" this outer layer, the insertion of the bottom taking place prior to the resetting of the adhesive. This accumulated adhesive, indicated at 33, Figure 2, serves to seal the bottom 35 tothe end of the inner layer Il and to effectively block off the end of the plies I2, i3, and thus prevent them from absorbing any liquid contents placed in the container. Thereupon, the projecting portion of the outer layer it?. is crimped, or spun, `to form a bead 3l which securely locks the bottom disk 33 against Ithe inner layer.

Due to the fact that the container body is formed of at least four plies or" paperboard, these plies can be relatively thin and yet With the method described produces a container body more durable and rigid than the conventional two ply body having the same total thickness or :ai

Weight of paper.

1t will be observed that this container is produced With conventional equipment, it being only necessary to add the heater 23 intermediate the tube Winding machine and the container making machine. The tools 39, 3 i or the equivalent, can be added to `one station of the container making machine, all whereby the container is made entirely automatic without any manual manipulation, and the resultant container is stronger and more durable than the conventional type of spiral wound can.

What I claim is:

1. A container comprising a tubular body formed oi inner and outer multi-ply cylindrical layers of paperboard, said layers being of equal length, said layers being axially displaced to produce extended end portions of reduced thickness, :one of said portions consisting of the outer layer only, the contiguous plies of said layers being joined together with a non-penetrating hot melt adhesive, said contiguous plies being joined to the other plies of said layers by a heat resistant adhesive, an end closure disk inserted and seated against the adjacent end edge of said 2o 3. A container initier layer and being sealed thereto by said hot melt adhesive.

2. The method of making ya container, the improvemenlt consisting in simultaneously winding 5 inner and outer multi-ply layers of paperboard,

securing the contiguous plies of said layers together with a non-penetrating hot melt adhesive, securing the contiguous plies of said layers respectively with a heat resistant adhesive to form lo a tubular formation, cutting said formation into container body sections, heating said severed sections to render said hot melt adhesive liquid, shifting one of said layers axially of the other while said adhesive is liquid, inserting a closure is disk into the extended end portion of the outer layer While said adhesive is liquiid, and seating the disk against the adjacent end of the inner layer1 and crimping said end portion of said outer layer against said disk.

comprising a tubular body formed of inner and outer multi-ply cylindrical layers of paperboard, said layers being of equal length, said layers being axially displaced to produce extended end portions of reduced thickt5 ness, one of said portions consisting of the outer layer only, the contiguous plies of said layers being joined together with a non-penetrating hot melt adhesive, said contiguous plies being joined to the other plies of said layers by a heat re- :1: sistant adhesive, an end closure disk inserted in the extended end portion of said outer layer and seated against the adjacent end edge of said `inner layer and being sealed thereto by said hot melt adhesive, and said extended end portion of said outer layer being crimped inwardly against the disk.

ISAAC L. WILCOX.

REFERENCES CITED 40 The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date at 576,980 Grimm Feb. 9, 1897 1,106,005 Shevllin Aug. 4, 1914 1,390,644 Ritchie Sept. 13, 1921 2,314,338 Graves Mar. 23, 1943 2,320,764 Ullrich une 1, 1943 59 2,337,656 Haycock Dec. 28, 1943 2,415,625 Coker Feb. 1l, 1947 2,461,539 Fletcher Feb. l5, 1949 FOREIGN PATENTS Number Country Date 492,163 Great Britain Sept. i5, 1938 OTHER REFERENCES The Technology of Adhesives, by John Delmonte, einhol Publishin@ Cori., U4 fr lin the extended end portion of said outer layer, D R d b y) w 7 paces 134, 165 and 166. 

